I think we should also realize there is a value in having n= something more than 1 here.
That is, if recording one source at the same time with 2 differen sets of cables but with 2 sets of identical mics, recorded with the same model recorder, same pattern, same stand with mics pairs within inches of each other is not perfectly valid since the mics are in different places, are different sets of mics, and different recorders, then these are still useful tests.
Run this test with this setup once and make judgements, then run it 20 or 50 or 100 more times (either going back and forth with what mics and recorder were used with each cable set, or by using entirely different matching sets of mics and matching recorders). If the same characteristics are noticed every single time for a given cable for a set of tests run this way 100 times (n=100), it would be much more logical to conclude the differences are due to the cables than to assume that somehow you randomly came to the same set of characteristics even though the location, mics, and recorders had been varied so many different times.